JEE Mains · Chemistry · STD 11 - 2. structure of atom
The most abundant elements by mass in the body of a healthy human adult are : Oxygen \((61.4\%);\) Carbon \((22.9\%),\) Hydrogen \((10.0\%);\) and Nitrogen \((2.6\%).\) The weight which a \(75\, kg\) person would gain if all \(^1H\) atoms are replaced by \(^2H\) atoms is ....... \(kg\)
- A \(15\)
- B \(37.5\)
- C \(7.5\)
- D \(10\)
Answer & Solution
Correct Answer
(C) \(7.5\)
Step-by-step Solution
Detailed explanation
Mass of hydrogen in human body \(=\frac{10}{100} \times 75=7.5 \,\mathrm{kg}\) If all \(^{1} H\) atoms are replaced by \(^{2} H\) atoms, then, the mass will become \(7.5 \times 2=15\,kg\). Therefore, the weight gain will be \(7.5\, \mathrm{kg}\)
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